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WO2016055103A1 - Configuration de canal d'accès aléatoire - Google Patents

Configuration de canal d'accès aléatoire Download PDF

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Publication number
WO2016055103A1
WO2016055103A1 PCT/EP2014/071545 EP2014071545W WO2016055103A1 WO 2016055103 A1 WO2016055103 A1 WO 2016055103A1 EP 2014071545 W EP2014071545 W EP 2014071545W WO 2016055103 A1 WO2016055103 A1 WO 2016055103A1
Authority
WO
WIPO (PCT)
Prior art keywords
random access
wireless communication
access channel
communication device
network node
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2014/071545
Other languages
English (en)
Inventor
Bengt Lindoff
Nadia BRAHMI
Erik Eriksson
Osman Nuri Can Yilmaz
Martin HESSLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to US15/517,607 priority Critical patent/US10349447B2/en
Priority to CN201480082594.3A priority patent/CN106797622B/zh
Priority to EP14781881.9A priority patent/EP3205166B1/fr
Priority to PCT/EP2014/071545 priority patent/WO2016055103A1/fr
Publication of WO2016055103A1 publication Critical patent/WO2016055103A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Definitions

  • the present invention relates generally to the field of configuration of radio resources for wireless transmission. More particularly, it relates to configuration of radio resources for random access transmissions.
  • a wireless communication device associated with the system and wishing to communicate through the system needs to transmit a random access (RA) message (or similar) to the system, thereby requesting radio resources for communication.
  • RA random access
  • the random access message itself may be able to carry some data (apart from the random access request) from the wireless communication device and may, thus, be used to convey smaller amount of data without a connection having to be set up.
  • the random access message should typically be transmitted over a random access channel (RACH) defined in association with the wireless communication system.
  • RACH random access channel
  • a wireless communication device is required to have a certain time and/or frequency synchronization accuracy vis-a-vis the system (e.g. a network node of the system).
  • Synchronization is typically achieved by having the wireless communication device listen to the downlink from a network node at regular time intervals (order of seconds) even when the wireless communication is not actively connected to the system.
  • the Critical-MTC concept may need to address design trade-offs regarding e.g., end-to-end latency, transmission reliability, system capacity and deployment.
  • the Critical-MTC system should provide for radio resource management that allows coexistence between different classes of applications, for example, applications with sporadic data requiring ultra-low latency (e.g., alert messages) along with applications with real-time periodic data requiring normal latency and/or applications with data under best-effort requirements.
  • Alert messages represent one potentially important type of messages that may benefit from the Critical-MTC application.
  • Alarms are typically rare events.
  • the wireless communication device e.g. a sensor
  • the wireless communication device may be of a type associated with low power and/or low cost.
  • such a type of wireless communication device may not be actively connected or synchronized to the network node continuously. For example, it may be battery driven with a requirement that the battery should last for a long period of time (order of years) and such a requirement may be impossible to fulfill (due to the associated power consumption) if repeatedly listening to the downlink for synchronization.
  • the wireless communication device first needs to acquire the appropriate
  • this is achieved by a method of a network node of a wireless communication system.
  • the method comprises configuring a first random access channel for transmission of random access messages from a first wireless communication device having a first synchronization accuracy vis-a-vis the network node and configuring a second random access channel for transmission of random access messages from a second wireless communication device having a second synchronization accuracy vis-a- vis the network node, wherein the second synchronization accuracy is lower than the first synchronization accuracy.
  • the method also comprises transmitting configuration information of at least the second random access channel configurations to the first wireless communication device and to the second wireless communication device.
  • the first and second synchronization accuracy may, for example, be in respect of synchronization in time, synchronization in frequency, or synchronization in time and frequency.
  • the first wireless communication device and the second wireless communication device are configured to communicate with the first wireless communication device and the second wireless communication device.
  • the communication device may be the same wireless communication device or may be different wireless communication devices.
  • the same first random access channel may be configured for one wireless communication device only or for several wireless communication devices.
  • the same second random access channel may be configured for one wireless
  • the method may further comprise transmitting configuration information of the first random access channel to the first wireless communication device and to the second wireless communication device.
  • the first and second random access channels may typically comprise one or more radio resources to be used for transmission of random access messages.
  • the second random access channel may comprise a frequency resource dedicated specifically to the second random access channel. In some embodiments, the second random access channel may comprise a frequency resource shared with other communication of the wireless communication system.
  • the second random access channel may further comprise a spreading code dedicated specifically to the second random access channel.
  • the method may further comprise monitoring the second random access channel, and (if a random access message transmitted from the second wireless communication device is detected on the second random access channel) determining a synchronization error of the second wireless communication device and transmitting a random access response to the second wireless
  • the synchronization error may, for example, comprise one or more of a frequency error and a timing error.
  • a second aspect is a method of a wireless communication device wherein a first random access channel is for transmission of random access messages from the wireless communication device when it has a first synchronization accuracy vis-a-vis the network node and a second random access channel is for transmission of random access messages from the wireless communication device when it has a second synchronization accuracy vis-a-vis the network node.
  • the second synchronization accuracy is lower than the first synchronization accuracy.
  • the method comprises receiving configuration information of at least the second random access channel from a network node of a wireless communication system.
  • the method may further comprise receiving configuration information of the first random access channel from the network node.
  • the method may, according to some embodiments, further comprise (when a random access message is to be transmitted due to pending data) determining whether or not the pending data is to be transmitted under requirements that are associated with the second random access channel. If it is determined that the pending data is to be transmitted under requirements that are associated with the second random access channel, the method may further comprise transmitting the random access message to the network node on the second random access channel.
  • the method may further comprise transmitting the random access message to the network node on the first random access channel.
  • the requirements may, for example, comprise one or more of:
  • the data needing to be transmitted with a low probability of missed reception.
  • the method may, in some embodiments, further comprise (after transmitting the random access message to the network node on the second random access channel) obtaining the first synchronization accuracy vis-a-vis the network node and receiving a random access response from the network node.
  • a third aspect is a computer program product comprising a computer readable medium, having thereon a computer program comprising program instructions.
  • the computer program is loadable into a data-processing unit and adapted to cause execution of the method according to any of the first and second aspect when the computer program is run by the data-processing unit.
  • an arrangement is provided for a network node of a wireless communication system.
  • the arrangement comprises a random access configuration unit adapted to configure a first random access channel for transmission of random access messages from a first wireless communication device having a first synchronization accuracy visa-vis the network node and a second random access channel for transmission of random access messages from a second wireless communication device having a second synchronization accuracy vis-a-vis the network node, wherein the second
  • the arrangement also comprises a transmitter adapted to transmit configuration information of at least the second random access channel to the first wireless communication device and to the second wireless communication device.
  • the transmitter may be further adapted to transmit configuration information of the first random access channel to the first wireless communication device and to the second wireless communication device.
  • the arrangement may further comprise a random access monitor adapted to monitor the second random access channel, and a synchronization error determiner adapted to determine a synchronization error of the second wireless communication device if a random access message transmitted from the second wireless communication device is detected on the second random access channel.
  • the transmitter may be further adapted to transmit a random access response to the second wireless communication device.
  • the transmission of the random access response to the second wireless communication device may be compensated based on the determined synchronization error.
  • a fifth aspect is a network node of a wireless communication system comprising the arrangement according to the fourth aspect.
  • an arrangement is provided for a wireless communication device, wherein a first random access channel is for transmission of random access messages from the wireless communication device when it has a first synchronization accuracy vis-a-vis the network node and a second random access channel is for transmission of random access messages from the wireless
  • the communication device when it has a second synchronization accuracy vis-a-vis the network node.
  • the second synchronization accuracy is lower than the first
  • the arrangement comprises a receiver adapted to receive configuration information of at least the second random access channel from a network node of a wireless communication system.
  • the receiver may be further adapted to receive configuration information of the first random access channel from the network node.
  • the arrangement may, according to some embodiments, further comprise a determiner adapted to determine (when a random access message is to be transmitted due to pending data) whether or not the pending data is to be transmitted under requirements that are associated with the second random access channel, and a transmitter adapted to (if it is determined that the pending data is to be transmitted under requirements that are associated with the second random access channel) transmit the random access message to the network node on the second random access channel.
  • a determiner adapted to determine (when a random access message is to be transmitted due to pending data) whether or not the pending data is to be transmitted under requirements that are associated with the second random access channel
  • a transmitter adapted to (if it is determined that the pending data is to be transmitted under requirements that are associated with the second random access channel) transmit the random access message to the network node on the second random access channel.
  • the arrangement may further comprise a synchronizer adapted to (after transmitting the random access message to the network node on the second random access channel) obtain the first synchronization accuracy vis-a-vis the network node after transmission by the transmitter of the random access message to the network node on the second random access channel.
  • the receiver may be further adapted to receive a random access response from the network node according to some embodiments.
  • a seventh aspect is a wireless communication device comprising the arrangement according to the sixth aspect.
  • An eighth aspect is an arrangement comprising a processor, wherein the processor is specifically adapted to carry out (or cause execution of) method steps of the method according to any of the first and second aspect.
  • a ninth aspect and a tenth aspect are a network node and a wireless communication device, respectively, comprising the corresponding arrangement of the eight aspect.
  • the third, fourth, fifth, sixth, seventh, eighth, ninth and tenth aspects may additionally have features identical with or corresponding to any of the various features as explained above for the first and second aspect, respectively.
  • the second aspect may additionally have features identical with or corresponding to any of the various features as explained above for the first aspect, and vice versa.
  • An advantage of some embodiments is that random access may be used without having to achieve system default synchronization accuracy vis-a-vis the network node.
  • Another advantage of some embodiments is that application of the random access procedure requires very low power consumption.
  • Yet another advantage of some embodiments is random access with low latency may be achieved.
  • Still another advantage of some embodiments is that a resource efficient and reliable way to accommodate time critical communication and regular communication within the same system.
  • Fig. 1 is a combined flowchart and signaling diagram illustrating example method steps and signaling according to some embodiments
  • Fig. 2 is a flowchart illustrating example method steps according to some embodiments
  • Fig. 3 is a flowchart illustrating example method steps according to some embodiments.
  • Fig. 4 is a schematic drawing illustrating example resource use according to some embodiments.
  • Fig. 5 is a schematic drawing illustrating example resource use according to some embodiments.
  • Fig. 6 is a block diagram illustrating an example arrangement according to some embodiments.
  • Fig. 7 is a block diagram illustrating an example arrangement according to some embodiments.
  • Fig. 8 is a schematic drawing illustrating a computer program product according to some embodiments.
  • a network node of a wireless communication system configures at least a first random access channel and second random access channel.
  • the first and second random access channels are for transmission of random access messages from wireless communication devices operating in association with the wireless communication system.
  • the first random access channel is for use by one or more wireless
  • the communication devices having a first synchronization accuracy vis-a-vis the network node and the second random access channel is for use by one or more wireless communication devices having a second synchronization accuracy vis-a-vis the network node, wherein the second synchronization accuracy is lower than the first
  • the first synchronization accuracy would be a "normal"
  • synchronization accuracy i.e. an accuracy that a wireless communication device is required to achieve before sending a random access request message over the first (also typically "normal") random access channel according to a typical scenario of the standard applied by the wireless communication system.
  • the second random access channel may typically be configured for wireless communication devices with low power requirements and/or low latency requirements (e.g. to achieve one or more of the advantages described above).
  • a wireless communication device with low power requirements may not be continuously synchronized to the network node.
  • the wireless communication device first needs to acquire the appropriate synchronization before it may transmit its message using the first random access channel, which may substantially delay the transmission. Such delay may be violating a low latency requirement of the transmission (e.g. for Critical-MTC having an ultra-low delay criterion). Therefore, the random access procedure typically used by the wireless communication device for initial access to the network node needs to be designed such that low latency transmissions by low power devices (e.g. rare alarm events) may be transmitted with high reliability.
  • the second random access channel (requiring a lower than normal synchronization vis-a-vis the network node) represents such a random access procedure design.
  • a wireless communication system may be configured with two types of random access channels.
  • the first random access channel type may be in accordance with "normal" random access approaches (with a preconfigured random access time/frequency resource which cannot be used without proper time-frequency synchronization).
  • the wireless communication device needs to be synchronized with at least the downlink of the serving/camping cell provided by the network node to use the first random access channel.
  • the second random access channel type may be designed for time-critical applications (alarms, etc.) where latency needs to be as low as possible.
  • the second random access channel type may allow transmission (e.g. a RA preamble) by the wireless communication device even if it is not time-frequency synchronized with the network node to the extent required for "normal" random access approaches.
  • the second random access channel may, for example, be configured to be transmitted on a separate frequency resource within the total system bandwidth only allocated for such time critical random access.
  • the second random access channel may, for example, be configured to be of code-spreading type (spread over the total system bandwidth or large subset thereof).
  • Figure 1 illustrates example method steps and signaling, according to some embodiments, between a network node (NWN) 110 a wireless communication system executing a method 120 and a wireless communication device (UE) 150 executing a method 160.
  • NWN network node
  • UE wireless communication device
  • step 121 the network node configures a first random access channel
  • RACH l which is for transmission of random access messages from a wireless communication device having a first synchronization accuracy vis-a-vis the network node.
  • the network node configures a second random access channel (RACH 2), which is for transmission of random access messages from a wireless communication device having a second (lower than the first) synchronization accuracy vis-a-vis the network node.
  • RACH 2 second random access channel
  • the configuration (steps 121 and 122) may be done during an admission control phase when the wireless communication device 150 detects the network node 110 and joins the wireless communication network.
  • the network node 110 transmits configuration information (RACH info) 191 to the wireless communication device 150 (and possibly also to other wireless
  • the configuration information (RACH info) 191 is received by the wireless communication device in step 161.
  • the transmission of the configuration information may be over a broadcast channel.
  • the configuration information comprises at least information regarding the second random access channel configuration.
  • the configuration information may also comprise information regarding the first random access channel configuration. Different or the same configuration information may be sent to other wireless communication devices.
  • the network node After having transmitted the configuration information 191, the network node monitors the configured random access channels (at least RACH 2, but typically both
  • RACH l and RACH 2 as illustrated in step 124.
  • Monitoring the configured second random access channel may, for example, comprise searching for signal signatures specified for the second random access channel.
  • signal signatures are typically configured (and thereby known) by the network node and, hence, matched filter techniques may be used for detection of the signal signatures.
  • the signal signature may, for example, be code-spreading signals.
  • the wireless communication device determines (in step 162) whether to use the first (RACH l) or second
  • step 162 may comprise considering under which requirements the data are to be transmitted. For example, RACH 2 may be used if one or more of the following requirements are fulfilled:
  • the data is of a type requiring low latency.
  • This requirement may, for example, be defined via a latency threshold specifying that latencies below the threshold are low latencies.
  • the requirement may be defined by assigning a latency classification to the data.
  • the data is of a type requiring a quick response (low response time) from the network node.
  • This requirement may, for example, be defined via a response time threshold specifying that response times below the threshold are low response times.
  • the data is of a high priority (e.g. alarms). This requirement may be defined by assigning a priority classification to the data.
  • the data is to be sent with a low probability of missed reception.
  • This requirement may, for example, be defined via a probability of missed reception threshold specifying that probabilities below the threshold are low probabilities of missed reception.
  • the data is to be sent with a low probability of false alarm.
  • This requirement may, for example, be defined via a probability of false alarm threshold specifying that probabilities below the threshold are low probabilities of false alarm.
  • step 162 may depend on the radio bearer the data is to be transmitted over (e.g. a different radio bearer configured for different random access channels). Yet alternatively or additionally, the radio bearer the data is to be transmitted over (e.g. a different radio bearer configured for different random access channels). Yet alternatively or additionally, the radio bearer the data is to be transmitted over (e.g. a different radio bearer configured for different random access channels). Yet alternatively or additionally, the
  • step 162 may be based on a message size.
  • a message threshold may be configured by the network or may be fixed in a standard, wherein the threshold determines if the first or second random access channel should be used.
  • a wireless communication device bases the
  • step 162 determination in step 162 on an elapsed time since the wireless communication device was last synchronized (e.g. related to a requirement on maximum drift of the oscillator). For example, the wireless communication device may determine to use RACH l if the maximum drift of a clock driven by the oscillator is less than a (e.g. predefined) time interval (e.g. the slot time).
  • a network node detecting activity on RACH 2 may utilize knowledge regarding how long the wireless communication device has been inactive (which implies a minimum drift at the wireless communication device) to improve the accuracy (e.g. compensate a random access response transmission).
  • the wireless communication device transmits (in step 163) a random access message 192 to the network node on the second random access channel (RACH 2).
  • the random access message transmitted using the second random access channel (RACH 2) may, for example, comprise a preamble with a sequence associated with the wireless communication device (e.g. sensor ID).
  • the message may comprise a message field (e.g. following the preamble).
  • the message field may be indicative of information related to a time-critical event triggering the network node access (RA) attempt.
  • the network node detects the activity (transmission of the random access message 192) on the monitored RACH 2 in step 125 and transmits a random access (RA) response 193 in step 126 (if a random access response (RAR) is to be transmitted for the particular random access message 192).
  • RA random access response
  • time/frequency configured RAR resources are time/frequency configured RAR resources
  • step 126 (synchronized, e.g. with the DL reference clock) may be used in step 126.
  • non-time aligned resources may be used in step
  • the timing and the carrier frequency used may, for example, be relative to the timing and detected frequency of the second random access channel detection (e.g. a detected RACH 2 signature).
  • the wireless communication device may monitor for a random access (RA) response in step 164 (if a random access response is to be transmitted for the particular random access message 192) and receive such a response 193 in step 165.
  • RA random access
  • the wireless communication device makes sure it obtains the first synchronization accuracy vis-a-vis the network node in step 166 before transmitting (in step 167) the random access message 194 to the network node on the first random access channel (RACH l).
  • the network node detects the activity (transmission of the random access message 194) on the monitored RACH l in step 127 and transmits a random access (RA) response 195 in step 128 (if a random access response is to be transmitted for the particular random access message 194, compare with step 126).
  • RA random access
  • the wireless communication device may monitor for a random access (RA) response in step 168 (if a random access response is to be transmitted for the particular random access message 194) and receive such a response 195 in step 169.
  • RA detection may imply other actions to be made by the network node (not shown in Figure 1).
  • the other actions may, for example, be related to a received RA sequence identity (ID), which may define which wireless communication device (e.g. sensor) sent the random access message (e.g. an alarm).
  • ID received RA sequence identity
  • the other actions may, for example, comprise one or more of performing an immediate stopping of a function or process associated with the network node, and immediately transmitting a report with high priority to another node (e.g. a server) associated with the network node.
  • Figure 2 illustrates an example method step 226 that may, for example, be implemented under step 126 of Figure 1.
  • the network node (after having detected activity on the second random access channel) determines a synchronization error (e.g. a frequency error) of the wireless communication device in step 231 (for example based on a received random access message, compare with 192) and then, in step 232, adjusts transmission of a random access response (compare with 193) based on the determined synchronization error (e.g. a frequency error) of the wireless communication device in step 231 (for example based on a received random access message, compare with 192) and then, in step 232, adjusts transmission of a random access response (compare with 193) based on the determined
  • a synchronization error e.g. a frequency error
  • Figure 3 illustrates an example method step 364 that may, for example, be implemented under step 164 of Figure 1.
  • the method step 341 of Figure 3 is particularly applicable if a random access response is expected or if more transmissions (apart from a random access message already transmitted using RACH 2) are expected to be done in the near future.
  • the wireless communication device (after having transmitted a random access message on the second random access channel) obtains the first synchronization accuracy vis-a-vis the network node in step 341 and then, in step 342, monitors for a random access response based on the first synchronization accuracy.
  • step 341 may be performed in parallel to step 163 of
  • Figures 4 and 5 illustrate example resource use in relation to the first and second random access channels (RACH l and RACH 2) according to some embodiments.
  • the principles of Figures 4 and 5 may, for example, be applied together with any of the methods as described in connection to Figures 1-3.
  • the random access (first random access channel, RACH l) is allocated in dedicated time/frequency resources as schematically illustrated by 411, 412, 413, 511, 512, 513.
  • the wireless communication device In addition to having to obtain certain synchronization accuracy before being able to use the first random access channel, the wireless communication device also needs to wait for the time instant of the allocated time/frequency resource before being able to transmit its random access message. This waiting time may introduce additional latency.
  • the second random access channel comprises a time resource (typically over a part of or over the entire system bandwidth 410), which is illustrated by 400 of Figure 4.
  • the time and/or frequency synchronization required to use the second random access channel are typically not very precise.
  • the time resource may be dedicated specifically to the second random access channel or may be shared with other communication of the wireless communication system.
  • the second random access channel comprises a frequency resource (typically a part of the system bandwidth 510), which is illustrated by 500 of Figure 5. In this case, there are no time restrictions to using the second random access channel.
  • a random access message may be transmitted at any time, which provides for a low latency.
  • the frequency resource may be dedicated specifically to the second random access channel or may be shared with other communication of the wireless
  • time and/or frequency resource of the second random access channel is shared with other communication of the wireless
  • the second random access channel may also comprise a spreading code dedicated specifically to the second random access channel. This provides for low interference between the second random access channel and the other communication of the wireless communication system.
  • the network may, for example, assign a different spreading code to each wireless communication device to be used for crucial communication (e.g. alarm signals). Potentially this can be a different interleaver in case of IDMA (interleave division multiple access) where the same spreading code is used by all devices and only the interleaver is used to differentiate between them.
  • IDMA interleave division multiple access
  • Another (shared) spreading code may be used by all devices for regular traffic which is scheduled in advance by the network.
  • N devices there will be N+l codes (or interleavers) in this example, and each device will have two spreading codes (or interleavers), one for crucial communication and one for regular traffic.
  • the second random access channel may be used without exact knowledge of the frequency and downlink timing of the network node.
  • a frequency error of up to 10-20 ppm may be allowed (where 10-20 ppm is a typical worst case scenario for a low cost/low power (cold start, i.e. without any prior knowledge of NW node carrier frequency) crystal oscillator in typical wireless communication devices).
  • frequency errors up to 10 ths of ppm may be tolerated (e.g. 10-30 kHz at 1-10 GHz carrier).
  • the first random access channel may typically not be used without exact knowledge of the frequency and downlink timing of the network node.
  • Figure 6 illustrates an example arrangement 600 according to some embodiments
  • the arrangement 600 may, for example, be comprised in a network node of a wireless communication system (e.g. NWN 110 of Figure 1).
  • the arrangement 600 may, for example, be adapted to perform the method 120 of Figure 1.
  • the arrangement 600 comprises a transceiver (RX/TX) 610, a random access configuration unit (RACH CONFIG) 620, a random access monitor (RACH
  • MON/DET 630
  • SYNCH ERR DET a synchronization error determiner
  • the random access configuration unit 620 is adapted to configure (compare with steps 121 and 122 of Figure 1) a first random access channel for transmission of random access messages from a wireless communication device having a first synchronization accuracy vis-a-vis the network node and a second random access channel for transmission of random access messages from a wireless communication device having a second synchronization accuracy vis-a-vis the network node, wherein the second synchronization accuracy is lower than the first synchronization accuracy.
  • the transmitter of the transceiver 610 is adapted to transmit configuration information to one or more wireless communication devices (compare with step 123 of Figure 1).
  • the random access monitor 630 is adapted to monitor the random access channels (compare with step 124 of Figure 1) and to detect activity on the random access channels (compare with steps 125 and 127 of Figure 1).
  • the synchronization error determiner 640 is adapted to determine a
  • the transmitter for the transceiver 610 is adapted to transmit a random access response to the second wireless communication device (compare with steps 126 and 128 of Figure 1 and step 226 of Figure 2).
  • the transmission is compensated based on the determined synchronization error of the synchronization error determiner 640 (compare with step 232 of Figure 2).
  • Figure 7 illustrates an example arrangement 700 according to some
  • the arrangement 700 may, for example, be comprised in a wireless communication device (e.g. UE 150 of Figure 1).
  • the arrangement 700 may, for example, be adapted to perform the method 160 of Figure 1.
  • the arrangement 700 comprises a transceiver (RX/TX) 710, a determiner
  • the receiver of the transceiver 710 is adapted to receive configuration information of at least a second random access channel (and possibly also of a first random access channel) from a network node of a wireless communication system (compare with step 161 of Figure 1).
  • the determiner 730 is adapted to determine, when a random access message is to be transmitted due to pending data in the transmission buffer 720, whether or not the pending data is to be transmitted under requirements that are associated with the second random access channel (compare with step 162 of Figure 1).
  • the transmitter of the transceiver 710 is adapted to transmit random access messages to the network node on the first or second random access channel, as determined by the determiner 730 (compare with steps 163 and 167 of Figure 1).
  • the monitor 750 is adapted to monitor for a random access response (compare with steps 164 and 168 of Figure 1 and steps 364 and 342 of Figure 3), and the receiver of the transceiver 710 is adapted to receive such a response (compare with steps 165 and 169 of Figure 1).
  • the synchronizer 740 is adapted to (after a random access message has been transmitted on the second random access channel) obtain the first synchronization accuracy vis-a-vis the network node (compare with step 341 of Figure 3).
  • DSP digital signal processors
  • CPU central processing units
  • FPGA field- programmable gate arrays
  • ASIC application-specific integrated circuits
  • Embodiments may appear within an electronic apparatus (such as a wireless communication device or a network node) comprising circuitry/logic or performing methods according to any of the embodiments.
  • an electronic apparatus such as a wireless communication device or a network node
  • a computer program product comprises a computer readable medium such as, for example, a diskette or a CD-ROM as illustrated by 800 of Figure 8.
  • the computer readable medium 800 may have stored thereon a computer program comprising program instructions.
  • the computer program may be loadable into a data-processing unit (PROC) 820, which may, for example, be comprised in a wireless communication device or network node 810.
  • PROC data-processing unit
  • the computer program When loaded into the data-processing unit, the computer program may be stored in a memory (MEM) 830 associated with or integral to the data-processing unit.
  • the computer program may, when loaded into and run by the data-processing unit, cause the data-processing unit to execute method steps according to, for example, the methods shown in any of the Figures 1, 2, and 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour un nœud de réseau d'un système de communication sans fil. Le procédé consiste à configurer un premier canal d'accès aléatoire pour la transmission de messages d'accès aléatoire provenant de dispositifs de communication sans fil présentant une première précision de synchronisation vis-à-vis du nœud de réseau, et un second canal d'accès aléatoire pour la transmission de messages d'accès aléatoire provenant de dispositifs de communication sans fil présentant une seconde précision de synchronisation vis-à-vis du nœud de réseau, la seconde précision de synchronisation étant inférieure à la première précision de synchronisation. Le procédé consiste également à transmettre des informations de configuration concernant au moins la seconde configuration de canal d'accès aléatoire à l'un des dispositifs de communication sans fil. L'invention concerne également un procédé correspondant pour un dispositif de communication sans fil, un produit-programme informatique, un nœud de réseau, un dispositif de communication sans fil et des agencements associés.
PCT/EP2014/071545 2014-10-08 2014-10-08 Configuration de canal d'accès aléatoire Ceased WO2016055103A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/517,607 US10349447B2 (en) 2014-10-08 2014-10-08 Random access channel configuration
CN201480082594.3A CN106797622B (zh) 2014-10-08 2014-10-08 随机接入通道配置
EP14781881.9A EP3205166B1 (fr) 2014-10-08 2014-10-08 Configuration de canal d'accès aléatoire
PCT/EP2014/071545 WO2016055103A1 (fr) 2014-10-08 2014-10-08 Configuration de canal d'accès aléatoire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/071545 WO2016055103A1 (fr) 2014-10-08 2014-10-08 Configuration de canal d'accès aléatoire

Publications (1)

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WO2016055103A1 true WO2016055103A1 (fr) 2016-04-14

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US (1) US10349447B2 (fr)
EP (1) EP3205166B1 (fr)
CN (1) CN106797622B (fr)
WO (1) WO2016055103A1 (fr)

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Also Published As

Publication number Publication date
EP3205166A1 (fr) 2017-08-16
US10349447B2 (en) 2019-07-09
US20170257891A1 (en) 2017-09-07
CN106797622B (zh) 2020-05-12
CN106797622A (zh) 2017-05-31
EP3205166B1 (fr) 2019-05-22

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